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NEW ZEALAND DAIRY FARM SYSTEMS AND KEY ENVIRONMENTAL EFFECTS
Jiafa LUO, Stewart LEDGARD
《农业科学与工程前沿(英文)》 2021年 第8卷 第1期 页码 148-158 doi: 10.15302/J-FASE-2020372
关键词: dairy farms environmental impacts grazing systems intensification mitigation
Error analysis of the parameters for non-coaxial grazing X-ray microscope
ZHAO Lingling, HU Jiasheng, LI Xiang
《机械工程前沿(英文)》 2007年 第2卷 第3期 页码 323-329 doi: 10.1007/s11465-007-0057-z
关键词: non-coaxial spherical manufacturing necessary diagnosis
The ecological adaptability of cloned sheep to free-grazing in the Tengger Desert of Inner Mongolia,
Xinxin LI,Huijuan WANG,Guanghua SU,Zhuying WEI,Chunling BAI,Wuni-MENGHE,Yanhui HOU,Changqing YU,Shorgan BOU,Guangpeng LI
《农业科学与工程前沿(英文)》 2014年 第1卷 第3期 页码 191-200 doi: 10.15302/J-FASE-2014029
关键词: somatic cell nuclear transfer free-grazing synchronization Dorper sheep cloned animal ecology
侯扶江,王春梅,娄珊宁,侯向阳,呼天明
《中国工程科学》 2016年 第18卷 第1期 页码 80-93 doi: 10.15302/J-SSCAE-2016.01.011
分析我国草原植物生产和动物生产,比较国内外草原生产力。结果表明,在过去的30余年中,我国一部分草原产草量下降,局部变化不显著。世界草原对畜产品生产的贡献率为40.08 %,中等收入国家为67.35 %。全球24.1 %的牛肉和31.9 %的羊肉来自草原,低收入国家草原载畜量分别高出高收入国家和中等收入国家87.4 %和66.4 %,畜产品生产分别只有两者的37.3 %和71.9 %。适宜的放牧利用,可使我国的草原生产能力达到6.35×109畜产品单位(APU);全国草原单纯依靠放牧每年可产肉2.959×106 t,占全国肉类总产量的3.5 %,占全国牛羊肉总产量的27.4 %。通过草原畜牧业的现代化转型可接近高收入国家水平,增产潜力约为50 %~200 %。
关键词: 草原生产力 产草量 放牧 载畜量 畜产品单位(APU)
Integrating space and time: a case for phenological context in grazing studies and management
Dawn M. BROWNING, Sheri SPIEGAL, Richard E. ESTELL, Andres F. CIBILS, Raul H. PEINETTI
《农业科学与工程前沿(英文)》 2018年 第5卷 第1期 页码 44-56 doi: 10.15302/J-FASE-2017193
关键词: GPS collars Jornada Experimental Range land-surface phenology livestock movement LTAR MODIS NDVI rangeland
利用六氟化硫示踪技术预估不同年龄阶段的放牧荷斯坦奶牛甲烷排放量
Steven J. Morrison, Judith McBride, Alan W. Gordon, Alastair R. G. Wylie, 闫天海
《工程(英文)》 2017年 第3卷 第5期 页码 753-759 doi: 10.1016/J.ENG.2017.03.018
动物和日粮因素对牛肠道甲烷排放量影响的相关研究已经很普遍,但是关于放牧青年奶牛的甲烷排放量的可参考数据较少。本研究评估了荷斯坦奶牛在多年生黑麦草草地放牧时的生理状态对甲烷排放量的影响,分别进行了以下两个试验:试验1从2011年5月开始,为期11个星期,试验2从2011年8月开始,为期10个星期。在每个试验中,将荷斯坦奶牛分成三个处理组(每组12头),分别由小牛犊、一岁的母牛犊和妊娠母牛组成(平均年龄分别为8.5、14.5和20.5月龄)。在每个试验的最后一个星期利用六氟化硫示踪技术预估每头牛的甲烷排放量。干物质摄入量由代谢能需要量除以牧草中的代谢能含量计算而得。正如预期一样,活体重随年龄的增加而增加(P < 0.001),然而试验1中三个分组的体增重没有差异,试验2中的体增重随着年龄增加有不同程度的减少(P < 0.001)。在试验1中,妊娠母牛高于小牛犊的甲烷排放量(P < 0.001),而一岁母牛犊的甲烷排放量最高(g•d-1)。当用单位活体重、干物质摄入量和总能摄入量表示甲烷排放量时,一岁母牛犊比小牛犊和妊娠母牛的排放速率更高(P < 0.001)。在试验2中,甲烷排放量(g•d-1)随着年龄增加呈线性上升(P < 0.001),但是这种差异在一岁母牛犊和妊娠母牛中并不显著。妊娠母牛的甲烷/活体重的比值低于另外两组(P < 0.001),小牛犊的总能摄入量中甲烷能量输出的比值低于一岁母牛犊和妊娠母牛(P < 0.05)。根据所有数据建立甲烷排放量的预测方程。所有关系均为显著(P < 0.001),R²值的分布范围为0.630~0.682。这些模型表明:每增加1 kg活体重,甲烷排放量增加0.252 g•d-1;每增加1 kg•d-1干物质摄入量,甲烷排放量增加14.9 g•d-1;每增加1 MJ•d-1总能摄入量,甲烷能量输出增加0.046 MJ•d-1。当实际甲烷排放量不可测时,这些结果为我们提供了预估放牧母牛甲烷排放量的另一种方法。
Grassland ecology in China: perspectives and challenges
Deli WANG, Ling WANG, Jushan LIU, Hui ZHU, Zhiwei ZHONG
《农业科学与工程前沿(英文)》 2018年 第5卷 第1期 页码 24-43 doi: 10.15302/J-FASE-2018205
关键词: biodiversity climate change China grazing meadow restoration steppe
Yingjun ZHANG, Wenjie LU, Hao ZHANG, Jiqiong ZHOU, Yue SHEN
《农业科学与工程前沿(英文)》 2018年 第5卷 第1期 页码 57-63 doi: 10.15302/J-FASE-2017192
关键词: diversity fertilizing grassland management practice grazing mowing productivity reseeding
Paulo César DE FACCIO CARVALHO, Jean Víctor SAVIAN, Tomas DELLA CHIESA, William DE SOUZA FILHO, José Alfredo TERRA, Priscila PINTO, Amanda POSSELT MARTINS, Sebastian VILLARINO, Júlio Kuhn DA TRINDADE, Pedro Arthur DE ALBUQUERQUE NUNES, Gervasio PIÑEIRO
《农业科学与工程前沿(英文)》 2021年 第8卷 第1期 页码 97-110 doi: 10.15302/J-FASE-2020380
关键词: grazing integrated crop-livestock systems mixed crops-livestock Pampa
Current status and prospects of reliability systems engineering in China
《工程管理前沿(英文)》 2021年 第8卷 第4期 页码 492-502 doi: 10.1007/s42524-021-0172-2
关键词: reliability effectiveness model-based systems engineering reliability systems engineering
Rini NISHANTH, Andrew WHYTE, V. John KURIAN
《工程管理前沿(英文)》 2018年 第5卷 第3期 页码 357-368 doi: 10.15302/J-FEM-2018022
Floating production storage and offloading (FPSO) units increasingly represent a practical and economic means for deep-water oil extraction and production. Systems thinking gives a unique opportunity to seek a balance between FPSO technical performance(s), with whole-cost; stakeholder decision-making is charged to align different fit-for-use design specification options’ that address technical-motion(s), with respective life-cycle cost analyses (LCCA). Soft system methodology allows situation based analyses over set periods-of-time by diagnosing the problem-at-hand; namely, assessing the antecedents of life-cycle cost relative to FPSO sub-component design alternatives. Alternative mooring- component comparisons for either new-build hulls or refurbished hulls represent an initial necessary consideration to facilitate extraction, production and storage of deep-water oil reserves. Coupled dynamic analysis has been performed to generate FPSO motion in six degrees of freedom using SESAM DeepC, while life-cycle cost analysis (LCAA) studies give net-present-value comparisons reflective of market conditions. A parametric study has been conducted by varying wave heights from 4 – 8 m to understand FPSO motion behavior in the presence of wind and current, as well as comparing the motions of turreted versus spread mooring design alternatives. LCCA data has been generated to compare the cost of such different mooring options/hull conditions over 10 and 25-year periods. Systems thinking has been used to explain the interaction of problem variables; resultantly this paper is able to identify explicit factors affecting the choice of FPSO configurations in terms of motion and whole-cost, toward assisting significantly with the front-end engineering design (FEED) phase of fit-for-purpose configured FPSOs, in waters off Malaysia and Australia.
关键词: FPSO LCCA spread/turret-mooring DeepC cost motion soft-systems
TRANSFORMING CHINESE FOOD AND AGRICULTURE: A SYSTEMS PERSPECTIVE
《农业科学与工程前沿(英文)》 2023年 第10卷 第1期 页码 4-15 doi: 10.15302/J-FASE-2023493
● The goals of Chinese food and agriculture have shifted from grain self-sufficiency to diversified goals, including protecting natural resources, reducing pollution and greenhouse gas emissions, and improving food safety and nutrition.
TRANSFORMATION OF FOOD SYSTEMS: HOW CAN IT BE FINANCED?
《农业科学与工程前沿(英文)》 2023年 第10卷 第1期 页码 109-123 doi: 10.15302/J-FASE-2023483
● The analysis of financing for the transformation of food systems requires first a consideration of costs.
关键词: financial markets food systems development financing consumer expenditures public budgets Sustainable Development Goals
Transition towards carbon-neutral electrical systems for China: Challenges and perspectives
《工程管理前沿(英文)》 2022年 第9卷 第3期 页码 504-508 doi: 10.1007/s42524-022-0220-6
关键词: carbon neutrality power systems electrification renewable energy
Applying an Integrated Systems Perspective to the Management of Engineering Projects
Simon P. Philbin
《工程管理前沿(英文)》 2015年 第2卷 第1期 页码 19-30 doi: 10.15302/J-FEM-2015004
关键词: integrated systems perspective engineering projects management
标题 作者 时间 类型 操作
Error analysis of the parameters for non-coaxial grazing X-ray microscope
ZHAO Lingling, HU Jiasheng, LI Xiang
期刊论文
The ecological adaptability of cloned sheep to free-grazing in the Tengger Desert of Inner Mongolia,
Xinxin LI,Huijuan WANG,Guanghua SU,Zhuying WEI,Chunling BAI,Wuni-MENGHE,Yanhui HOU,Changqing YU,Shorgan BOU,Guangpeng LI
期刊论文
Integrating space and time: a case for phenological context in grazing studies and management
Dawn M. BROWNING, Sheri SPIEGAL, Richard E. ESTELL, Andres F. CIBILS, Raul H. PEINETTI
期刊论文
利用六氟化硫示踪技术预估不同年龄阶段的放牧荷斯坦奶牛甲烷排放量
Steven J. Morrison, Judith McBride, Alan W. Gordon, Alastair R. G. Wylie, 闫天海
期刊论文
Grassland ecology in China: perspectives and challenges
Deli WANG, Ling WANG, Jushan LIU, Hui ZHU, Zhiwei ZHONG
期刊论文
Grassland management practices in Chinese steppes impact productivity, diversity and the relationship
Yingjun ZHANG, Wenjie LU, Hao ZHANG, Jiqiong ZHOU, Yue SHEN
期刊论文
LAND-USE INTENSIFICATION TRENDS IN THE RIO DE LA PLATA REGION OF SOUTH AMERICA: TOWARD SPECIALIZATION OR RECOUPLING CROP AND LIVESTOCK PRODUCTION
Paulo César DE FACCIO CARVALHO, Jean Víctor SAVIAN, Tomas DELLA CHIESA, William DE SOUZA FILHO, José Alfredo TERRA, Priscila PINTO, Amanda POSSELT MARTINS, Sebastian VILLARINO, Júlio Kuhn DA TRINDADE, Pedro Arthur DE ALBUQUERQUE NUNES, Gervasio PIÑEIRO
期刊论文
Floating production storage and offloading systems’ cost and motion performance: A systems thinking application
Rini NISHANTH, Andrew WHYTE, V. John KURIAN
期刊论文